#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
	int n, u, v;
	cin >> n;
	for (int i = 1; i < n; i++)
		cin >> u >> v;
	if (n % 2)
		cout << "Alice";
	else
		cout << "Bob";
	return 0;
}
